wbzl20求条

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b;
    cin>>a>>b;
    int c=0;
    for(int i=a;i<=b;i++){
        if(i%400==0||(i%4==0&&i%100!=0)) c+=i;
    }
    cout<<c;
    return 0;
}